Lisbon in May
In May, Lisbon has 45.1 mm (1.78 in) of rain, a daily high of 22.5 °C (72.5 °F) and a daily low of 14.7 °C (58.5 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records.
Last updated : first sourced version.
Best time to visit Lisbon: May meets our rule. Expect 5.0 rain days (model estimate) and days that grow by 52 min.
What May is like in Lisbon
- Usually on a Sunday early in May, the procession of Nossa Senhora da Saúde passes through Praça Martim Moniz. City gunners began it more than four centuries ago. Source: Wikipedia, checked .
- In mid-May, a procession of candles honours Our Lady of Fátima. It sets out from the Igreja de Nossa Senhora das Dores. Source: Junta de Freguesia de Avenidas Novas, checked .
- In late spring, jacarandas throw a purple mantle over Lisbon. Largo do Rato and Largo do Carmo are two places to see them. Source: Visit Lisboa (Turismo de Lisboa), checked .
- Around International Museum Day in May, the Palácio Pimenta holds a Baroque ball, with a dance master to lead the steps. Source: Museu de Lisboa, checked .
Key figures
Weather in May, 1991-2020 model estimates
- Daily high
- 22.5 °C (72.5 °F)
- Daily low
- 14.7 °C (58.5 °F)
- Rain
- 45.1 mm (1.78 in) in the month
- Sunshine
- no data
Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high and Days with rain: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked . How we make and test model estimates
Model estimate for the ERA5-Land grid cell at 38.7° N, 9.1° W, 4 km from the city centre point.
How we define and convert these figures
Notes. Sunshine: Not in our ERA5-Land estimates.
Daylight on 15 May 2026
- Sunrise
- 06:25 local time
- Sunset
- 20:42 local time
- Day length
- 14 h 17 min
Day length 1-31 May: 13 h 49 min to 14 h 41 min, +52 min.
Source: NOAA Solar Calculator equations, checked .
Month by month
Each month: daily high in °C, then rain in mm, 1991-2020 model estimates.
ERA5-Land model estimates 1991-2020, as above, checked .
This month against the year
| Measure | May | Rank |
|---|---|---|
| Daily high | 22.5 °C | equal 5th warmest |
| Daily low | 14.7 °C | 6th warmest |
| Rain | 45.1 mm | 5th driest |
| Sunshine | no data | no data |
| Day length | 14 h 17 min | 3rd longest |
Equal values share a rank. How we rank months
Lisbon in May, on average: 5.0 rain days (1 mm or more). Model estimate, adjusted against station records.
ERA5-Land model estimates 1991-2020, as above, checked .
Day length: NOAA solar equations, checked .
Public holidays this month
| Date | Holiday |
|---|---|
| Friday | Labor Day |
Typed from the official list and re-checked, .
May 2027: no data. No official page gives the 2027 Easter and Corpus Christi dates yet.
English names are from the holidays library where the official list gives none. How we check holidays
Source: Official public holiday list (dgaj.justica.gov.pt), checked ; holidays Python library, checked . Library: holidays 0.105.
Same month in 8 model-estimate cities
Lisbon is warmer than 4 of our 8 model-estimate cities in May by mean daily high. How we rank cities
Closest high and low in May: Istanbul (1.2 °C apart), Porto (1.5), Sydney (1.9).
| City | Gap from Lisbon, °C | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|---|
| Lisbon (this page) | — | 22.5 | 14.7 | 45.1 | no data |
| Istanbul (closest) | 1.2 | 21.6 | 13.3 | 37.0 | no data |
| Porto (closest) | 1.5 | 21.8 | 12.4 | 98.1 | no data |
| Sydney (closest) | 1.9 | 20.7 | 12.7 | 72.7 | no data |
| Melbourne | 5.3 | 17.6 | 9.0 | 50.5 | no data |
| Mumbai | 11.7 | 34.0 | 26.5 | no data | no data |
| Bangkok | 12.1 | 34.7 | 26.7 | no data | no data |
| Delhi | 14.7 | 41.2 | 25.4 | no data | no data |
Sources (1991-2020): ERA5-Land model estimates, checked . Each city's page names its grid cell. All sources in full on Methodology.
Sources
- Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked .
- NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked .
- holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked .
Official sources
Cite this page: City by Month. "Lisbon in May: weather, daylight, holidays". https://citybymonth.com/cities/portugal/lisbon/may/. Last updated 8 November 2026.